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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7935f5c5c8922cc04299c0ee5c0d8a3cbb61f5e30e7087336091b7acfb9f3a6' 
  AND token = 'xjxC4yjq9JFEV6utWdWrp8jF2W1ocgzgfbe2CP2Zoto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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