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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1adf6ae095747229ac025cb8584cdfef18364167a78f45e628a893a9da13510' 
  AND token = '2UeuDQw27O0ZJIMmO7SzPt5CC63odzofN/ZAFj6Q464=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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