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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ae331fe7c87a465e83b740bed937505e82ae3bb3b1916c53f464e109c572c5' 
  AND token = 'U/QRrv5YfjhCn4u8T4xNds3iwHb0cDPw0W4tU6w6NDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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