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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9217e5bfdbbf49d20fc4cf068f7c77df7d41d4ad56d087f1cfe2d0dc59dbdbe6' 
  AND token = 'Rj1JloTfenqeCC7dqmcYgXkE4FVQg7vJlhvP473HINI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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