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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62aaacf757d0f4dc85508078db103fd05d39603d39522a973016edd07afed80e' 
  AND token = 'Mx6rPLCwTzkGeSl5DRABNbDFH9ksmw6zrzAUXZgVsj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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