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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8f6f4231cf44879e995ea7d582c5215a5cb222e0f96ee2828a5f128da1ec39' 
  AND token = 'vhY9KCeDw1M3XwAM9ZXBHEKO485KoEHdmIzFFLlFCVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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