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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4402202a32481f79b2e2b6259af8bc804a44b309f6469792dc4a78c8a2a0476a' 
  AND token = '9VU5T6tk1tLAohKLLiHSGok7BtSltIGfuaI7KWkKPVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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