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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fda17514c1bb05a1591422ea3d88273ddd22b02f636073b49885a3c9b6fed96' 
  AND token = 'cZM3OtqOf7a2m1qPQK9RCBVL4xgLptqvk3jf6VpFfx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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