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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3906d4d681a0a84278fbcd698b94aab2f90dd3f2cbdab81c0a0549dc6a32384' 
  AND token = 'yiYLEeheIV9rW1tcRzp/TMkTQ5dsJ9BEJLf0XFuWZ5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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