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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cc49d9261f7190d7220ee72742ecc4642c3935fea29c4b15fb76f8753e2ead' 
  AND token = 'lW3WYvX6V3mAzhG+dlyWBg1kHysse5cmp3lrWAjMZpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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