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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '649189697ea725597a10382a1351e56bb6484031e68d06d55f1d79ec7146bee9' 
  AND token = 'T20kK6GmKFXk/wJIqpW6+SyAyU4vbzufT6V2Kc5n940=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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