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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3405bd9eb07bf78dcec9b35b6894ca8e4ceb8a7c8ff7dd5a69831ded5e26397f' 
  AND token = 'nFnNNYH91PSjy9LW+0/1tlGX9XnnfYFA6MTePIN9cuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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