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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c913defd605d122650dee0e14254e3f6e61d515c768f9067f09671310bf0a5a' 
  AND token = 'Gd/6QndSG7wA5cBmYwuYmIWVaS9VIP7JhMY7yPv/sPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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