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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c69a61faf2f9db2db9dacf4ecbf8da39e0e028f13a4831e74dd0c8f8686bb4' 
  AND token = '0CiUfkD64R75c2FajsmIQ4vOoyvnJdq7BM9RNORZ5Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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