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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd9eeefe4646e6037099367d0dd5ac83644ed6679779e0920799e8880664355' 
  AND token = '7i4krEW1FHuyYnGXOSV1jRYphp2I0rWULZSwc7fbFUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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