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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bf0d288d8904a034890086275de879bf284d7260920ee8656a7e2936e7398d' 
  AND token = '23LF04eIqXBkPoB9qdIAQh3K13a8JaiJE+wd2cQZzmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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