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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8d592cb09f3e6bd7fd80c7e683aa18a2d29b13d61b6686cc70e7fd4a8bc129' 
  AND token = 'WAlA/6PD/PWnR564HhidJC7qadlWUEf1gJ9BcIuqnRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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