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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8329a7adcc607a0de15fc0d4bb645c69486169652ce35f028f32033bc99cf68d' 
  AND token = '3O4ldhDppP5yH/fdVpLDVLDrCaY5BSYpE0jgrtiUmW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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