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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e157c87ed24f71e1f71baa38629e19d13eab7ab6993de4734e03fd097d871e' 
  AND token = 'pvI6ZQcli3fq76+2GEJw6jI061BYG3830+B1Ttpr354=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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