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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f209acf671140dbd336a844b2ee18aad04baacf259347585331f7bd0f1edad92' 
  AND token = 'm2PsTfNqc7kNAq2xjMFeBCKR7oHqtciSvwCwv6DZ1/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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