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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67ed034618258ba5292b97c85f4138a4f9c71cdf8a92519632f5f1c305715f9' 
  AND token = 'GoNQvCLYaqxqmLXtWsmGHLDdxWoUvbN8VpXtfy9TwbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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