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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87b1cdf6ada6bbd211a2697b26fc08120e5b6de536be447c8e161f2a362b8eb' 
  AND token = 'ZJSyUYWDoPAFjBunGv3zMnR6E5wbzsdPlR1w3TqeEQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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