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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819404a0c0720164d34171890c4f6f16dbfd6d42c233ad76d162d859c4f7ee8a' 
  AND token = 'QJf8bdal7zwVRQBLRfhS9Wl4aXoZEdl3xqQg+1ubrtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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