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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8431f129eca8d563e434a2c0ad47883eadeb22bc8a49f3d0481fc713dbb23acd' 
  AND token = 'XWhIeHXfrn003/ZR6UXss9ds1jkHGBGjgKA5Cuf9FaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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