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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9effb9d79edbeed87bf5b4a7d0a91212a4153057faccdf6a8e4b498b21db510f' 
  AND token = 'XcJK0IzAwH9ZaIyNQBxEhSgmQGyBFm3d1z/bfGfn4h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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