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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81d03fc2944fb4e56f4f28d93555e9aa16ddc37ae40b894d59b78b7f34d354f' 
  AND token = 'YHogwizIXPqxZajzeysAGBBysE08t91rRZBtCxuM898=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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