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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a110dd73cbbd66ac5ecf67a0dd41f7edb5fe30839a26a7db8214fff3eb706b' 
  AND token = 'ljtMICbb9wwq2gQMIlV+Badcy5QIA9K3z12Vj0mdLcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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