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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f5d06e3ec22fd9fedb3b81573d93a31b3f76f142b54edb2e3d2ff14a08ab9b' 
  AND token = 'C4wbuTZgwwzEZofjtOoSsI/tA637zrffQ1OkIuXZyd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}