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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3a85858958a427c58f4d16679be11f68b2090d1cddb564e21fc43405b9e4c0' 
  AND token = 'Tl2hv3UbWAMIOeLF7Nvdjno/qSIkN77I5ov03qOP9TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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