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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5252c948d2364025b73bf8adf61bf4e7699ef44c000281d405809d650ee6f8' 
  AND token = 'MhFT44pxkjUIIFIBlrQFtu795IJiVK50PZC9OVcSE9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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