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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45418eb60a1adb712d8e08cbea31dcd83c366c0cc42c3669188c9876ad36f54d' 
  AND token = 'UDVdgk51qmKG/WYrJXkbk0UIeMis1b4WwI1hsikE5z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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