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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c11e1d4160a5a1591582f4c167dd2f109dffca7f2b777bb5968bfe0eb9a680e' 
  AND token = 'm8OdOTmNHM8MeTdgpueQhCiFaW6yEAEmmklxYWNV/5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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