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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a132e6fe0ce3f88d0089063b58b3343a8d6360e544c36562b85d37b76cba84f' 
  AND token = 'KCOf5QVCU5hIEFyY0GACmylymL+ParbDWnNUbpVbXZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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