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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e6a4ef600b870c3ddff1eeed6b306df834067d9b21fb956c25b4d93d882c90' 
  AND token = 'RCU5huQQDdBqEbsX06NKX2+ovZAV4e2ckk0VBDRkP/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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