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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5319a5dd0221b3e786a9796895a0330d8b38a3bcd6ffae8405573fae2584645' 
  AND token = 'kvH776y3hg1ZUQeUpO9oI7PmPbsGVDbqMSOmRMJuVAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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