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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a456d7aa196a0d4374a1c5c0a8f49423a321aa83cee5150f55d2a319ef40a06' 
  AND token = '3G0HbKZh06Mm3jElobpx+5V/n1XTGvDQOCSrvjdzj2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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