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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd793248880ca005369c64a76f81eb965241988214382b1f769b3de35ca37bf80' 
  AND token = 'Kbe19WVc6HmtVPioNgv6FvT7uHGAIwfp1+t/Ii6fQTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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