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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b391f9e0b9668c6c340554b395b736e2dd02669ec54a10de62484d6383a9d61' 
  AND token = 'sYxyT6CqH91A0ASkR6ayH4gjRycEZj1E2G9aeQwhrFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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