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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e2634aef8f46ae13329c5c8598bf12662601c40d79bd34ec2c43eda63ca4df' 
  AND token = 'b6Ir7fM8xPPcZNvQIWtBeCKoqQlSYD7BdgC9phXZY/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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