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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9410772fb4b041a5b0a9c266944a6a97baaee9931caa17ed05be16a4895183f7' 
  AND token = 'YMoR3UrBea+4xTKou1NkIiMqgk/57KqaLbm5M5NYkNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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