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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7314b219ebe5d6248893a65b4f927c3fa05f1651edef1d92676a438b57233c' 
  AND token = 'N1sgqrH+0tNsBtYtxa1DA5c/eBP8c6ICuRt7GOcBlys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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