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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd70ab6763d3bcb999dbf48815d85ac7c9c319f6e61b2c0fda9109053ae6cdb5' 
  AND token = 'ptLIZtS2yAa4N6d0A4SYSTpBjinCA37Wj5HkCANGsy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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