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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5ff68d89d6161e74005a22c32f1677e3a19a7e017eed50b45beea9472a9d2e' 
  AND token = 'UkQIJ7L4WiI6/9Tl3bFgMMte3by6i0/c8xVgBr7wIww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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