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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84850878233d0266bfd5a03e50586ab31c2279d1b2b4726cbc489ba55764b65a' 
  AND token = 'muRcde08knR5Dy3WhcD3jGb0kThGQAHWmBQMhr7b0Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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