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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69aa99b8850a8078dfc0a3a1576936ef20ee7efcb1ab4dc903e8c70efb553742' 
  AND token = '70eH/Osp9ntYxxFue+GQfxRlwfIjwp1owEOMvBhe3q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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