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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7309c3e92f588af7a43a8d40d57f94dcd32f208900d4836f5bb0fd97b165ed84' 
  AND token = 'sWdGCUBJB0QroL65RKBC+PyGkZy4V72M1eo/9LJVjkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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