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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379b1178f7ce73b1fbae4690835d104e69cced75d233d00f53303b0c211eec00' 
  AND token = 'mAl4D1bKjAc2YHFK8CrZQnyM4BYvfP8C5oIYRXwLqXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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