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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad01720a5862dee649f269dcdbbb73aa9b11fe4cebdcafb33060dd61c7e4c6b6' 
  AND token = 'II/pkwam6sWZSN82EgUNq5V4imqDd6tFRr/mT0eR7cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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