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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb35d10f3b94a98cc2ebec86555559d95384fdfe068784575ce21597fa0c883' 
  AND token = 'yOeKgMbOh0BgXq69stPJO0Z92rPal8gIgk1+H3qTR08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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