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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed407d0af0fc11eaf6108954b99ab6ddc8445ac532accc7f1113b8573e7f5b1' 
  AND token = 'flIXJFUgdi7paBYEztvbMKffUzF2/vNF0bOJ8KdAx5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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