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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd157ab6c2433c43193dcd4dd6100189d7608bfa29ae263b6f468ac0aa118ed9f' 
  AND token = 'guEVd//vjMxLOTuDD7+MPE9sbNvCMkF40KWY43ZnCYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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