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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e65ff5b0ad41e96102f3039c25b8a976ac749ab1f276b60dc2a130b2f24a70' 
  AND token = 'aL+QZLExvRcv4zwU9wXP2hWaFkLXJ67XxacLkz3U//s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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