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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570f74d765a1c2b6e43716cc57c7062550b592eeabd1eb4a946845e5b9104eda' 
  AND token = 'XNr7FjbJW0RQfwvryC+e9P1r11uM/sNvgp5OokaNUoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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