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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4dcd6c0d66ab09de6496727bdcd3a31210f9462cfb99fe9c0c16a2f35f02d15' 
  AND token = 'C4jdX40dL/nzNy5+LZlG6OvY5Q5PM94/aRKFVUxZ+y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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