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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67806d2ed6437b574b06b971894c092f0b2b26d1eda83b9edb9d28f31981a26' 
  AND token = 'xbft1gAZ2Tyg92Gxn14oX4X5SpZbpV+y/cSz2JwwsxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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