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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa1c2bc268575ea991249110cce46a59f29272ecb9ca0a1ef23a07497ce4f45' 
  AND token = '0iqElMz8ry3eioav0UC6IMNtnIE/KCV57zLw/8UmJ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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