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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f63a8eec093dc3040536e7773ec74b0438659fdab3b4f47f8636dabc696800' 
  AND token = 'xB+WyiWah1TaTY2WFFENkQ0H1Lbh5SsvUjjAR9NsngU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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