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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899a62c16d5eadf856330d3cfe5ed001aae2d88414698f649c1fa6bb39073d8c' 
  AND token = 'SkLmE9DSCEkyIEu3UnqQXDy1uyinsP7EMiR138qMMMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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