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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2d5666843bf64a6365fd40732d92f5e543de3ee82bf89bea3ea85f357df44d' 
  AND token = '9wJtrz3BF1gSMS/fsJ1L7K6/Fc0HZf4FbxYky8AckMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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