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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22af0eb7246e993c3a5ffe0e52fc8aca6101c1fedc40ec8c9c2ce95e773af3f' 
  AND token = 'IBRc0Y8PsU8HH1vv/lDUx7qUKVTn9cPys4ph6D7S3ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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