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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffaf03ecb3f118918205c0f11ae7f7dfd392216679ebb4a60715b1df7aabec32' 
  AND token = '+f44jcvNjXZFTXt58PW27CTZ6jlXNI8tqhB7DDepR4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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