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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bc56395ee8be8b55aeebad16235774ee72952051e490c98acc5fac9c88f655' 
  AND token = '2n3G7/xFy1WiXW5DMvcwLUOzXj/lCxnUJuM8Xopo0oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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