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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a66597a92902c7c3d695e20c6fd96dde572cadacdb9feb4ce817a593c28857' 
  AND token = '7pYHuHJ3NiaJN6rS8j8Q/eIud9UwscX6R6xWfl0ZYE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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